Journal
METALS
Volume 9, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/met9080846
Keywords
detonation spraying; coating; metallic glass; microstructure; bonding strength; microhardness
Funding
- Russian Foundation for Basic Research
- Novosibirsk region [19-43-543034 r_ mol_ a]
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The present work was aimed to demonstrate the possibility of forming Fe66Cr10Nb5B19 metallic glass coatings by detonation spraying and analyze the coating formation process. A partially amorphous Fe66Cr10Nb5B19 powder with particles ranging from 45 mu m to 74 mu m in diameter was used to deposit coatings on stainless steel substrates. The deposition process was studied for different explosive charges (fractions of the barrel volume filled with an explosive mixture (C2H2 + 1.1O(2))). As the explosive charge was increased from 35% to 55%, the content of the crystalline phase in the coatings, as determined from the X-ray diffraction patterns, decreased. Coatings formed at explosive charges of 55-70% contained as little as 1 wt.% of the crystalline phase. In these coatings, nanocrystals in a metallic glass matrix were only rarely found; their presence was confined to some inter-splat boundaries. The particle velocities and temperatures at the exit of the barrel were calculated using a previously developed model. The particle temperatures increased as the explosive charge was increased from 35% to 70%; the particle velocities passed through maxima. The coatings acquire an amorphous structure as the molten particles rapidly solidify on the substrate; cooling rates of the splats were estimated. The Fe66Cr10Nb5B19 metallic glass coatings obtained at explosive changes of 55-60% showed low porosity (0.5-2.5%), high hardness (715-1025 HV), and high bonding strength to the substrate (150 MPa).
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